U.S. Marine Corps photo by Lance Cpl. Sarah Luna/Released 140117-M-ML009-022.JPG
Jan 31, 2014
Robert M. Gates, 22nd United States Secretary of Defense and author of Duty: Memoirs of a Secretary at War, signs copies of his newly released book at the Marine Corps Exchange on Marine Corps Base Quantico on Jan. 17, 2014. Nearly 1,000 copies were sold in two days at the exchange.
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